slip-0039: fix versioning paragraph

slip-0039.md

@@ -84,7 +84,7 @@ We will use `PBKDF2(PRF = HMAC-SHA256, Password = master_secret, Salt = "SLIP003
 
 ## Versioning
 
-Our scheme doesn't support versioning. This is intentional to avoid unclear claims such as SLIP-0039 compatibility without a clear understanding, which version of the scheme is actually meant. We encourage creating a new document for any new improvements. Since the master secret is easily retrievable, migration to a new scheme is trivial.
+Our scheme doesn't support versioning. This is intentional to avoid unclear claims such as SLIP-0039 compatibility without a clear understanding, which version of the scheme is actually meant.
 
 ## Localization